作者:Andrei V. Malkov、Ian Baxendale、Darren J. Mansfield、Pavel Kočovsky
DOI:10.1016/s0040-4039(97)01052-6
日期:1997.7
The new Mo(II) triflate complex 5 has been found to catalyze the CC bond forming allylic substitution with silyl enolethers derived from β-dicarbonyls (e.g., 6 + 12 → 14) and from simple ketones (e.g., 6 + 13 → 16) as nucleophiles.
Cyclopentanone as a Cation-Stabilizing Electron-Pair Donor in the Calcium-Catalyzed Intermolecular Carbohydroxylation of Alkynes
作者:Tobias Stopka、Meike Niggemann
DOI:10.1021/acs.orglett.5b00312
日期:2015.3.20
Although they have been used as reactivity-controlling additives in cationic polymerizations for decades, Lewis basic electron pair donor (ED) compounds were never used for the stabilization of cationic intermediates in transformations of small molecules. As such an ED, cyclopentanone proved highly efficient for the stabilization of allyl and vinyl cations in combination with our calcium-based catalyst system. Therefore, the first general transition-metal-free intermolecular carbohydroxylation of alkynes with allyl and propargyl alcohols was realized.